Simplify xpointer useage in example

examples/common/node.xml

 <?xml version="1.0" encoding="UTF-8"?>
-
-<profile xml:id="node">
-  <xi:include
-    xmlns:xi="http://www.w3.org/2003/XInclude"
-    href="node/time.xml"
-    xpointer="xpointer(id('time')/*)"/>
-  <xi:include
-    xmlns:xi="http://www.w3.org/2003/XInclude"
-    href="node/parameters.xml"
-    xpointer="xpointer(id('parameters')/*)"/>
+<profile xmlns:xi="http://www.w3.org/2003/XInclude">
+  <xi:include href="node/time.xml"
+    xpointer="xpointer(/profile/*)"/>
+  <xi:include href="node/parameters.xml"
+    xpointer="xpointer(/profile/*)"/>
 </profile>

examples/common/node/parameters.xml

 <?xml version="1.0" encoding="UTF-8"?>
-
-<profile xml:id="parameters">
+<profile>
   <topics publish="ALLOW" subscribe="ALLOW" >
     <topic>parameter_events</topic>
   </topics>

examples/common/node/time.xml

 <?xml version="1.0" encoding="UTF-8"?>
-
-<profile xml:id="time">
+<profile>
   <topics subscribe="ALLOW" >
     <topic>/clock</topic>
   </topics>

examples/sample_policy.xml

@@ -4,49 +4,49 @@
   <profiles>
     <profile ns="/" node="talker">
       <xi:include href="common/node.xml"
-        xpointer="xpointer(id('node')/*)"/>
+        xpointer="xpointer(/profile/*)"/>
       <topics publish="ALLOW" >
         <topic>chatter</topic>
       </topics>
     </profile>
     <profile ns="/" node="listener">
       <xi:include href="common/node.xml"
-        xpointer="xpointer(id('node')/*)"/>
+        xpointer="xpointer(/profile/*)"/>
       <topics subscribe="ALLOW" >
         <topic>chatter</topic>
       </topics>
     </profile>
     <profile ns="/" node="add_two_ints_server">
       <xi:include href="common/node.xml"
-        xpointer="xpointer(id('node')/*)"/>
+        xpointer="xpointer(/profile/*)"/>
       <services reply="ALLOW">
         <service>add_two_ints</service>
       </services>
     </profile>
     <profile ns="/" node="add_two_ints_client">
       <xi:include href="common/node.xml"
-        xpointer="xpointer(id('node')/*)"/>
+        xpointer="xpointer(/profile/*)"/>
       <services request="ALLOW">
         <service>add_two_ints</service>
       </services>
     </profile>
     <profile ns="/" node="minimal_action_server">
       <xi:include href="common/node.xml"
-        xpointer="xpointer(id('node')/*)"/>
+        xpointer="xpointer(/profile/*)"/>
       <actions execute="ALLOW">
         <action>fibonacci</action>
       </actions>
     </profile>
     <profile ns="/" node="minimal_action_client">
       <xi:include href="common/node.xml"
-        xpointer="xpointer(id('node')/*)"/>
+        xpointer="xpointer(/profile/*)"/>
       <actions call="ALLOW">
         <action>fibonacci</action>
       </actions>
     </profile>
     <profile ns="/" node="admin">
       <xi:include href="common/node.xml"
-        xpointer="xpointer(id('node')/*)"/>
+        xpointer="xpointer(/profile/*)"/>
       <actions call="ALLOW" execute="ALLOW">
         <action>fibonacci</action>
       </actions>